# Max Relay Output Conversion

Discussion in 'General Electronics Chat' started by ERobishaw, Jul 28, 2008.

1. ### ERobishaw Thread Starter New Member

Jul 21, 2008
3
0
Given a DPDT relay rated at .5A @ 120VAC,
Does it compute that the relay will handle 2.5A @ 24VAC ?

(i.e., 120/24 * .5A = 2.5A)

Here's the full specs, if it matters:

Meisei m4-24h
1A 24V DC / .5A 120V AC
Max ratings
Power 60W DC / 120VA AC
Switching Current 2A DC/AC

Apr 5, 2008
19,914
4,141
Hello,

Contacts
Arrangement.......................................................................... 2 Form C
Type ......................................................................Bifurcated Crossbar
Material
Ratings (Resistive Load) ..........................1A 24V DC / 0.5A 120V AC
Max. Switching Power..........................................60W DC / 125VA AC
Max. Switching Voltage ........................................220V DC / 250V AC
Max. Switching Current ......................................................2A DC / AC
Min. Switching Load ..................0.01mA 10mV DC (Reference Value)
Expected Life (Min. Operations)
Mechanical............................................................................100 million
Electrical (Resistive Load) ............................0.5 million at 1A 24V DC
0.2 million at 0.5A 120V AC
Contact Resistance ..............................................50mΩ Max. at initial

Greetings,
Bertus

3. ### mik3 Senior Member

Feb 4, 2008
4,846
70
The answer was given by bertus but i want to add that the current rating of a relay is not calculated like the way you did it. The voltage rating for a relay is not given to calculate the power rating but not to apply a voltage greater than this voltage because you will create sparks on the contacts. Of course the voltage plays a little role on how much current the contacts can carry but because they have very low resistance the power dissipated by them is almost the same even with low and high voltages.